There are already flame graph implementations. But I think that they lose the extensibility and simplicity.
https://github.com/RudjiGames/rprof looks nice,. But it is complex.
https://github.com/bwrsandman/imgui-flame-graph is simple. But it only measure fix type of events.
So I code a widget that use scope timer to measure time, and use simple draw function to draw flame graph, which is less than 100 lines.
cmake -S . -B build
cmake --build build/Running the SimpleImGuiFlameGraphExample example will display an example window showcasing the flame graph widget. The code is available for reference in example/main.cpp.
TestFun();
FlameGraphDrawer::Draw(TimerSingleton::Get().GetScopeTimes(),
TimerSingleton::Get().GetMaxDepth(),
TimerSingleton::Get().GetGlobalStart());
TimerSingleton::Get().Clear();
1.Time measurement and flame graph drawing are separated.
Example:
TestFun();
FlameGraphDrawer::Draw(TimerSingleton::Get().GetScopeTimes(),
TimerSingleton::Get().GetMaxDepth(),
TimerSingleton::Get().GetGlobalStart());
TimerSingleton::Get().Clear();Implementation code of FlameGraphDrawer::Draw is simple. Less than 100 lines.
2.Time measurement can be used in any scope, only one line of macro code is needed.
Example:
void TestFun()
{
FUNCTION_TIMER();
std::random_device rd; // Will be used to obtain a seed for the random number engine
std::mt19937 gen(rd()); // Standard mersenne_twister_engine seeded with rd()
std::uniform_int_distribution<> dis(1, 3000);
{
SCOPE_TIMER("Test Scope 1");
int count = dis(gen);
for (int i = 0; i < count; i++)
{
int x = dis(gen);
}
{
SCOPE_TIMER("Test Scope 2");
int count2 = dis(gen);
for (int i = 0; i < count2; i++)
{
int x = dis(gen);
}
}
{
SCOPE_TIMER("Test Scope 3");
int count3 = dis(gen);
for (int i = 0; i < count3; i++)
{
int x = dis(gen);
}
}
}
{
SCOPE_TIMER("Test Scope 4");
int count = dis(gen);
for (int i = 0; i < count; i++)
{
int x = dis(gen);
}
}
}Timer class refers to https://github.com/TheCherno/Hazel
FlameGraphDrawer class refers to https://github.com/bwrsandman/imgui-flame-graph